Process of rolling round metal bars to eliminate laps, seams, and scale



TJ LLEWELYN, JR PROCESS OF ROLLING ROUND METAL BARS T0 ELIMINATE LAPS, SEAMS, AND SCALE. I

APPLICATION mm FEB. H. 1919. 1,381,572, Patented June 14, 1921. v 2 SHEETS-SHEET].

' HTTOR/VEY T. LLEWELYN, 13. ND METAL BARS T0 ELIMNATE L AP APPUCATION HLED FEB.1h'l9\9.

PROCESS OF ROLLING ROU S, SEAMS, AND SCALE.

' 2 SHEETS-SHEET 2.

Patented June 14,1921

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ATTORNEX Parent series.

THOMAS LLEWELYN, 1a., 0]? PITTSBURGH, PENNSYLVANIA.

PROCESS OF ROLLING ROUND METAL BARS T0 ELIMINATE LAPS, SEAMS, AND SCALE.

Application filed February 11, 1919.

To all whom it may concern e it known that I, THOMAS LLnwnLYN, Jr, a citizen of the at Pittsburgh, in the county 01". Allegheny and State of Pennsylvania, have invented new and useful Process of Rolling Round Metal Bars to Eliminate Laps, SGEIII1S,H1C1 Scale, of which the following is a specification.

This invention ing metal and more particularly to' a process of producing object being to produce rolled round metal bars without the usual side seam or bead which generally occurs in rolling round bars by the now known process.

. nether object is to produce rolled round metal bars without the usual scale or which occurs when rollin round metal bars, especially iron lVith these objects in view the consists in the novel rangement of parts, illustrated in the accompanying drawings, and particularly pointed out in the append ec claims, it being understood that various changes in the form, proportions, size and construction may be made appended claims, without departing from the spirit or sacrificthe advantages of the invention.

In '16 drawin s:

1e twelve figures represent the twelve pairs of rolls, which compose, successively used from 1 to 12, the twelve operations in the process of rolling from a billet of the dimensions shown by the dotted lines in Fig. bar as indicated'by and steel. invention and ar- To those skilled in the art it is well known that in producing round metal bars, from ten to twenty passes are usually made through the mill before the bar is delivered. The type of mill employed for this process is mown as the Merchant mill. the billet of heated metal being fed into enough to b employed, the groove in the successive pairs )f rolls generally alternate from square or ipproximately square to oval, The square Specification of Letters Patent.

United States, residing illustrated Patented June let, 1921. Serial No. erases.

grooved rolls ordinarily are arranged with the corners of the square on the vertical and horizontal, that is the sides of the square would be at to the horizontal side of the rolls and the oval rolls with the longer dimensions of the oval on the approximate center between the pair of rolls. This has been thought to be the best arrangement of rolls to reduce a billet to a round stock, but it very frequently happens that employing mills with this succession of rolls, produce "lalry stock, that is the finished round; bar has a scaly surface. This scale is usually caused bv a too rapid IGlflllCtlOll of the billet, which causes the outer portion of the metal to become loose, that is a sort of slight crystallization of the outer surface of the metal takes place. Scale also not infrequently occurs if too many passes are employed in the mill, thus allowing the metal to cool below the desired working point.

e overcome the objections in Merchant mills now known and employed 1 have designed after a careful study and experiment the twelve pairs of rolls successively used a herein shown, and it is more especially the last six passes here illustrated, that are designed to properly work the metal to produce a bar without scale.

It will be noted that the first tour passes L and a will work the billet down to a substantially broad flat ar. Instead of the horizontal oval generally employed as the next pass I use a pair of rolls having grooves which in cross section describe a common parabola, as shown in Fig. 5, which work the bar delivered from pass l inwardly from the sides to pro duce a bar with a blunt faced top and bottom and a slightly bulged center portion. .lhe next pass illustrated in 9 works it out once more into a iiattened bar slightly smaller than. the bar delivered from pass 4-.

1e bar emerging from pass 6 is then run between perfectly fiat rolls in the next two passes shown in Figs. 7' and 8. which reduce it to the din'iensions illustrated by the dotted lines in Big. 9. The bar is inserted through pass 9 as indicated by the said dotted lines. It will e seen that the bar will not be permitted to spread greatly at the sides in running through pass 9, which is also of the double parabola shape, the pressure from the rolls of this pass being directed against the ends of the bar and forcing the central portion against the inclined sides of the grooves in the rolls. The peculiar action thus produced on the metal prevents the 7 sides from splitting away as is the case when 11 the bar s a diagonally squared ar is run through a horizontal oval pass. The next steps 10 and 11 reduce the same efiect upon the bar as 8 and 9 respective y. Emerging from pass now ready for the finishing sass. It Wlll be seen by referring to the dotted lines oi Fig; 12 that the pressure from the rolls in this figure Will be substantially similar to the pressure 0 the rolls on passes 9 and the bars 0% the shape illustrated in Fig. 9, that is a constant pressing in o the ends while the intermediate portion is brought in contact at the bottom edgeoi the grooves.

described my process as used While I have on but one type oi mill it is obvious that any continuous mills guide, bar, Merchant and may be employed.

1 claim: 7

1. The method of rolling round bars consisting in rollin a billet into substantially rectangular cross sectional shape, then rolling the product into substantially oval cross sectional shape, then rolling the product into substantially rectangular cross sectional shape, then rolling the product again into oval cross sectional shape, then rolling the product. flat, then rolling the product again into oval cross sectional shape and finally rolling the product into circular cross sectional shape.

2. The method of forming round bars from metal, consisting in rolling a billet into successive rectangul sectional shapes of different sizes, then rolling the product into oval cross sectional form, then rolling the product into rectangular cross sectional form, then rolling the product flat, then rolling. the product again into oval cross sectional shape, then rolling the product again at and finally rolling the product into circular cross sectional form.

I 3. The method of forming round bars consisting in rolling a billet into rectangular cross sectional shape, then rolling the product into oval cross sectional shape, then rol ing the product into rectangular cross sectional shape, then rolling the product -flat, then rolling the product into oval cross sectional shape of less ,area than shape, then flattening the product, ing the product into oval cross sectional shape of less area than the second oval shape and finally rolling the product into circular cross sectional shape. a

In testimony that I claim the above, I have hereunto subscribed my name.

rnoMAs LLEWELYN, JR. 

